diff options
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index c99bf9f01759..5792686936c1 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -20,6 +20,7 @@ #include <linux/idr.h> #include <linux/hdreg.h> #include <linux/blktrace_api.h> +#include <linux/smp_lock.h> #define DM_MSG_PREFIX "core" @@ -288,6 +289,45 @@ static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) return dm_get_geometry(md, geo); } +static int dm_blk_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct mapped_device *md; + struct dm_table *map; + struct dm_target *tgt; + int r = -ENOTTY; + + /* We don't really need this lock, but we do need 'inode'. */ + unlock_kernel(); + + md = inode->i_bdev->bd_disk->private_data; + + map = dm_get_table(md); + + if (!map || !dm_table_get_size(map)) + goto out; + + /* We only support devices that have a single target */ + if (dm_table_get_num_targets(map) != 1) + goto out; + + tgt = dm_table_get_target(map, 0); + + if (dm_suspended(md)) { + r = -EAGAIN; + goto out; + } + + if (tgt->type->ioctl) + r = tgt->type->ioctl(tgt, inode, file, cmd, arg); + +out: + dm_table_put(map); + + lock_kernel(); + return r; +} + static inline struct dm_io *alloc_io(struct mapped_device *md) { return mempool_alloc(md->io_pool, GFP_NOIO); @@ -1377,6 +1417,7 @@ int dm_suspended(struct mapped_device *md) static struct block_device_operations dm_blk_dops = { .open = dm_blk_open, .release = dm_blk_close, + .ioctl = dm_blk_ioctl, .getgeo = dm_blk_getgeo, .owner = THIS_MODULE }; |